I don't know about Titan,but when I compared the Radar side by side with my iPhone, they didn't have much of a difference except for when viewing a page completely zoomed out. The Radar showed jadgged pixels whereas iPhone didn't. but it isn't a big deal IMO. I couldn't read the iPhones text zoomed out because the screen is too small.
But I agree with the OP,some reviews just give the Titan a low score becaus of its dispay ppi which is ridiculous IMO. One of those sites is gsmarena.com. these guys didn't even know what ppi was lol but as soon as iPhone 4 was released,they paid a lot of attention to ppi and gave a low score to any dispay with 300 or lower ppi.